Fixture support



R. L. CALL FIXTURE SUPPORT Jan. 10, 1933.

Filed sept. 1o, 1952 2 Sheets-sheet 2 Patented Jan. 1.0, 1933 UNITEDvSTATES PATENT. YOlii-TICE REGINALD L. CALL, OF MERIDEN, CONNCTIUT,ASSIGNOR TO THE CHARLES PARKER COMPANY, OE MERIDEN', CONNECTICUT, ACORPORATION FIXTURE SUPPORT Application led September 10,-1932. SerialNo. 632,487.

This invention relates to an improvement in fixture supports andparticularly to supports employing a plate adapted to be secured to awall or other surface and formed with an outwardly-projecting stud, overwhich a fixture is set and connected with the stud by a transversescrew.

The object of this invention is to form the stud, fixture and screw sothat by the insertion of the screw, the fixture will be crowded againstthe plate and the flanges of the fixture firmly against the wall, andthe invention consists in the construction as hereinafter described andparticularly recited in the claims.

In the accompanying drawings:

Fig. 1 is a vertical sectional view through a fixture supportconstructed in accordance with my invention and showing the initialposition in assembling the parts;

Fig. 2 is a similar view, with the screw entering the stud;

Fig. 3 is a similar View, showing the screw approaching its finalposition;

Fig. 4 is a similar view, showing the screw in its final position andthe fixture seated against a wall;

Fig. 5 is a sectional view on the line 5 5 of Fig. 4; and

Fig. 6 is a sectional view on the line 6-6 of Fig. 4.

In carrying out my invention, I employ a plate 10 adapted to be securedto a wall or other structure 11 by screws 12. This plate is formed withan outwardly-extending stud 13 which has a transverse threaded opening14, the outer end 15 of the opening being counterbored.

A fixture 16 of any approved design and for the desired purpose isformed with a flange 17 provided with a chamber 18 to set over the plate10. This fixture is formed with a longitudinal recess 19 entering fromthe back and adapting the fixture to be set over the stud 13. In oneside of the fixture is an opening 20 and in line with this opening inthe other side is a conical recess 21. Adapted to be entered into theopening 20, and engaged with the threads 14 is a screw 22 having atruncated cone end 23 adapted to enter the conicalv recess21. Theopening 20 is slightly larger in diameter than the diameter of the head24 of the screw.

Fig. 1 shows the parts in the first position of assembly. The screw hasbeen inserted through the hole 20 with the conical surface of its pointresting against the cuter edge of the counterbored hole 15. So far noforce has been applied to the screw and `there is no pressure betweenthe flange and the wall. A slight pressure with a screw driver will nowforce the screw into the counterbored portion 15 and engage one edgethereof, and so tend to crowd the flange against the wall as shown inFig. 2 of the drawings.

In this Fig. 2, the screw has not been turned by a screw driver, but thescrew has been forced axially to the bottom of the counterbore where thethreads are now ready to interlock upon rotation of the screw undersustained axial pressure. It will be noted that the screw is slightlycanted, bearing upon the fixture at the inner side of the hole 2O andthe outer side of the counterbore 15. The forces involved at this stageare due to the intentional misalignment between the hole in the fixtureand the tapped and counterbored hole in the stud. At this stage aportion of the flange of the fixture is crowded against the wall at oneside, while it is still free from the wall at the opposite point.

Fig. 3 shows the screw inserted with a screw driver up to the pointwhere the conical surface 23 touches the conical recess 21 in thefixture. It will be noted here, as in Fig. 2, that the screw is stillslightly canted, bearing against theV inner side of the hole 2O andagainst the outer side of the threads in the stud, the conical end ofthe screw just touching the conical recess in thelixture. The loosenessof the threads has been intentionally exaggerated but the principle oflocation of forces is thereby more clearly illustrated. -llVere thescrew to be left in this position, the sole force holding the fixture tothe wall would necessarily be concentrated by the Contact of the screwwith the inner side of the hole 20. Here again one side of the flange isforced against the wall, while the other is slightly free therefrom, nopres- Cil sure being exerted at the point where it is free.

F ig. 4 shows the parts in the final position in which the screw isinserted. Here the screw has been driven home and has come to final restin the conical recess in the fixture, and the screw has assumed aposition at right angles to the stud, the screw bearing against the rearwall of the opening 20 and the rear wall of the conical recess 2l, thesebearings being equally divided, and in the stud uniformly distributedbetween the threaded portions of the screw and stud. It should be notedlthat the flattened point of the screw does not bottom in the conicalrecess in the fixture, but bears at the inner side thereof and againstthe inner side of the hole 2O so as to bring the fixture to a positionat right angles to the stud and the flange in contact with the wall,throughout its entire circume ference.

The screw thus effectively bridges the fixture, seating at both sides ofthe stud and exerting effective force on opposite sides of the fiangeinstead of at one side only, and there is a well distributed bearing inthe thread of the stud instead of a bearing at just one side.

It is this latter feature, coupled with the truncated cone-shaped pointon the screw, that enables the device to function as itr does indistributing' the bearing' properly between the .fixture and the stud.

I claim:

l. In a fixture support, comprising a plate and a stud, the stud formedwith a transverse opening counter-bored and threaded, a fixture formedwith a longitudinal opening from its inner end for the. reception ofsaid stud, said fixture formed on one side with a clearance opening andon the other side with a conical notch, the apex of which is at one sideof the longitudinal center of the stud opening, and a screw having atruncated conica-l end adapted to pass through the opening in thefixture, engage with the threads in the stud, and enter the conicalrecess, whereby the fixture is forced onto the stud and firmly engagedtherewith.

2, In a fixture support, comprising a plate and a stud, the stud formedwith a transverse opening' counterbored and threaded, a fix ture formedwith a longitudinal opening from its inner end for the reception of saidstud, said fixture formed on one side with a clearance opening and ontheother side with a conical notch, the apex of which is at one side ofthe lon gitudin al center of the stud opening, and a screw slightly lessin diameter than the diameter of the opening in the fixture and thediameter of the threaded opening in the stud, said screw having atruncated conical end adapted to pass through the opening in thefixture, engage with the specification.

REGINALD L. CALL.

RID

